`scope` around `mount` ineffective?
问题 (While this discusses Blacklight engine, I believe the question is actually purely about Rails.) I am trying to add internationalisation to my Blacklight app. To that end, I wrapped everything in config/routes.rb into scope "(:locale)", locale: /en|ja/ , and in app/controllers/application_controller.rb I added before_action :set_locale and overrode default_url_options as suggested by Rails i18n guide. Most things work, but there's one thing I haven't been able to figure out. All of my